Nature of Operations, Segment Reporting and Geographical Information - Additional Information (Detail) $ in Thousands	12 Months Ended
Jan. 31, 2020 USD ($) Segment	Jan. 31, 2019 USD ($) Segment	Jan. 31, 2018 Segment
Segment Reporting Information [Line Items]
Number of reporting segments \| Segment	2
Customer accounted for greater than 10% of net sales \| Segment	0	0	0
Goodwill assigned	$ 12,034	$ 12,329
T&M [Member]
Segment Reporting Information [Line Items]
Goodwill assigned	4,500	4,500
Product Identification [Member]
Segment Reporting Information [Line Items]
Goodwill assigned	$ 7,500	$ 7,800

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant